Question

resolva a equação de 2 grau x(elevado a 2 ) +2x+x+2=0

Answer 1

x²+2x+x+2=0⇒ x²+3x+2=0
a=1; b=3; c=2
∆=b²-4ac→ ∆=3²-4.1.2⇒ Δ=9-8⇒ Δ=1
x=-b±√∆ / 2.a→ x=-3±√1 / 2.1⇒ x=-3±1 / 2
x'=-3+1/2⇒ x'=-2/2⇒ x'= -1
x"=-3-1/2⇒ x"=-4/2⇒ x"= -2
S={-1 , -2}